Method of casting molten metal



Ap l 1931- J. G. COLLINS ET AL METHOD OF CASTING MOLTEN METAL Filed April 29, 1929 &

IIVVENTOR.

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Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE JOHN G. COLLINS AND WILLIAM J. Brannon, or person, MICHIGAN, nssrenons 'ro NATIONAL ALLOYS 00., A conronnrion or MICHIGAN METHOD J5 CASTING MOLTELN' METAL Application filed April 29,

Our invention relates to a new and useful improvement in a method of casting molten metals and has for its object the provision of a method of casting molten metals whereby the cast metal when cooled will be free from imperfections such as gas and air pockets and will'be possessed of a grain superior to that possible under known methods.

It is another object of the invention to provide a method of casting whereby impurities in the molten metal may be deposited below the mold proper so that the cast metal will be substantially free from all impurities and a homogeneous metal provided free from air and slag.

It is another object of the invention to provide a method of casting whereby shrinkage in the mold will be reduced to a minimum.

Another object of the invention is the provision of a method of casting whereby the disturbance in the metal is eliminated and deoxidization of the metal eifected before its entry into the mold proper.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed. I

The invention will be best understood by i a. reference to the accompanying drawings which form a part of this specification and in which,

Fig. 1 is a longitudinal vertically sectional view through a mold adapted for carrying out the process.

Fig. 2 is a sectional View taken on line 22 of Fig. 1.

Fig. 3 is a view similar to Fig. 1 showing a different form of mold.

Fig. 1 is a View taken on line 44 of Fig. 3.

Fig. 5 is a view similar to Fig. 1 of a still different form of mold.

Fig. 6 is a view taken on line 66 of F ig. 5.

The mold box 9 is provided with the mold cavity 12 communicating with which is the riser opening 13. Formed in the mold box 9 below the mold cavity 12 and communicat-- ing therewith through a constricted neck 11 is a cavity 10 which is in communication with the sprue 14:. The mold illustrated in Fig. 1 is used for casting cylindrical tubular box 1929. Serial No. 359,120.

and positioned in the mold box at opposite sides of the mold cavity 12 are guide members 15 and 16 having central openings formed therein which are in alignment with each other and which serve as bearings for the core.

In pouring the molten metal is poured into the sprue 14 from which it passes into the settling cavity 10 and as this cavity fills, the molten metal rises upwardly through the neck 11 so as to fill the mold cavity 12 from the bottom up, thus permitting the metal to rise slowly and in an undisturbed and deoXidizedcondition from the settling cavity 10 into the mold cavity 12. The impurities in the metal will be permitted to settle in the settling cavity 10 and thus the casting produced will be one of fine grain, of increased tensile strength, of homogeneous texture and one free from air pockets and similar imperfections. This method of casting may be utilized in both sand and permanent molds and may be utilized for casting specific types and shapes of castings as well as billets and slabs. The method is also especially adapted for use in casting nickel and aluminum alloys and for all grades of hearing and bushing bronze. A superior alloy is produced when pouring bronze in that the difliculty of the bronze in laying to the iron mold without causing gas holes in the alloy are eliminated.

In Figs. 3 and 4 we have shown the mold 16 with the settling cavity 17 communicating through the neck 18 with the mold cavity 19, extending longitudinally of which is the riser opening, the sprue 21 communicating with the settling cavity 17. In these figures the adaptation of the invention to the casting of slabs is illustrated.

In Figs. 5 and 6 we have illustrated the invention adapted for use in pouring pistons, the mold 21 having the settling cavity 23 communicating with the sprue 24 and through a.

constricted neck with the mold cavity 22, communicating with which is the riser opening 25. The plug opening 26 is indicated at one side of the mold opening 21.

While we have illustrated and described the preferred form of my invention, we do not wish to limit ourselves to the precise detail of Structure shown but desire to avail ourselves of such variations and modifications as come within the scope of the appended claims. I

Having thus described our invention, what we claim as new and desire to secure by-Let-.

ters Patent is: i

1. A mold having a mold cavity communieating through a constricted passage with a settling cavity at its baseand having a; sprue communicating with saidsettling cavity; and

core supporting members .positionednat op posite ends of said mold cavity.

2. A mold having a -mold cavity and a settling cavity positioned below said mold cavity and extending throughout the length of said mold cavity and provided'with a constri'ctedv passage throughout the length of said-settling cavitypositioned between said moldcavityand said settling cavity and es- 1 tablishing a communication between said cavities throughout their lengths.

'3. 'A-mold having a mold cavity communicating through-a constricted passage with a settling cavity at its base and having a sprue communicating with isiad settling cavity;

and annular core supporting'members positioned at opposite ends of said mold cavity.

In testimony whereof we have signed the foregoing specification. e

JOHN G. COLLINS. WILLIAM J. REARDON. 

